Berkshire Hathaway Class B ownership discounts

I learned today non-index investments of their Class B allows owners of the stock to apply for discounts with the companies they own. The most noted name is GEICO but what other discounts with those companies do they do?

Aside from cruise lines which require hundreds of shares bought and held for at least 6 months, are there any other companies offering customer discounts based upon stock ownership status?
 

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